A day before observers were to have their first look at the city at the heart of a nine-month-old revolt, there was no sign of Assad carrying out a plan agreed with the League to halt an offensive against protests and start talks with the opposition. Amateur video posted to the internet by activists showed three tanks in the streets next to apartment blocks in the Baba Amr district. One fired its machinegun and another appeared to be launch mortar rounds. Gruesome video showed mangled bodies lying in pools of blood on a narrow street. Power lines had collapsed and cars were burnt and blasted, as if by mortar rounds. "What's happening is a slaughter," said Fadi, a resident living near the flashpoint Baba Amr neighbourhood. He said it was being hit with mortar shells and heavy machinegun fire. An armed insurgency is increasingly eclipsing civilian protests in Syria. Now many fear a slide toward a sectarian war pitting the Sunni Muslim majority, the driving force of the protest movement, against minorities that have mostly stayed loyal to the government, particularly the Alawite sect to which Assad belongs. Fighting in Homs has intensified since a double suicide bombing in Damascus on Friday that killed 44 people.